Recently, Wuhan Moen Intelligent Electric Co., Ltd. successfully delivered an SF6 gas recovery and refilling unit to Guangxi Electric Co., Ltd. The unit, model MOEORW-WQH11, is designed for SF6 gas handling in GIS, circuit breakers, and other SF6-insulated equipment during maintenance, decommissioning, and gas recycling operations at multiple 110 kV and above substations in Guangxi.
- Core Performance: Final Pressure ≤53 kPa, Recovery Rate ≥97%
The MOEORW-WQH11 SF6 gas recovery and refilling unit adopts the freezing liquefaction method and integrates six functions: recovery, refilling, purification, vacuum evacuation, storage, and cylinder filling. Key technical specifications are as follows:
- Recovery capability: For 1 m³ of SF6 gas with an initial pressure of 0.8 MPa, the time required to reduce the pressure to ≤53 kPa (absolute) is less than 2.5 hours, leaving extremely low residual pressure and minimizing gas waste.
- Liquid storage: Equipped with a 200 L storage tank; nominal liquid storage capacity of 200 kg; maximum storage pressure of 3.8 MPa, facilitating long-term preservation and transport.
- Filling efficiency: Filling 1 m³ from an initial pressure of 133 Pa to 0.8 MPa takes less than 0.8 hours.
- Vacuum limit: Ultimate vacuum of the unit ≤10 Pa; evacuating 1 m³ from atmospheric pressure to 133 Pa takes less than 1.0 hour.
- Purification quality: For SF6 gas with an initial moisture content below 1000 ppm, after one recovery and purification cycle, moisture ≤60 ppm (wt), oil content ≤10 ppm (wt) – the gas can be directly re-used.
- Sealing and noise: Annual leakage rate <1%; whole‑unit noise ≤75 dB(A), suitable for indoor and outdoor operation.
- Environmental adaptability: Operating temperature range -10℃ to 40℃; built‑in temperature protection allows normal start‑up even in cold regions.
- Technical Highlights: Maintenance‑free regenerative drying, phase sequence protection, power‑off anti‑backflow
- The unit incorporates several improvements addressing on‑site operation pain points:
- Drying and filtration system: Uses heat‑regenerable molecular sieves. When saturated, they can be reactivated by a built‑in heating process without replacement, significantly reducing consumable costs.
- Oil control: Two oil separators at the compressor discharge, combined with high‑efficiency filters, ensure oil content in the recovered gas is <10 ppm.
- Electrical protection: Built‑in phase sequence protector automatically corrects the power phase to prevent compressor damage from reverse rotation; a solenoid valve at the vacuum pump inlet prevents oil backflow into the gas path during a power failure.
- Air‑cooled design: No external water source required – the condenser is forced air‑cooled, suitable for substations without water supply.
- Easy mobility: Hand‑pushed mobile type; dimensions 197×92×186 cm; weight approx. 1000 kg; equipped with high‑quality casters for easy transfer between work sites.
- Field Application: Supports CCER Methodology for Quantified Carbon Reduction
China's Ministry of Ecology and Environment and the National Energy Administration have jointly issued the CCER methodology for SF6 Recovery and Purification from Electrical Equipment, which requires accurate accounting of recovered SF6. The MOEORW-WQH11 is equipped with a precision vacuum gauge and pressure gauges to record gas quantities before and after recovery, meeting the data requirements for emission reduction verification.
Guangxi Electric Co., Ltd. will deploy these units at key regional substations to achieve "recover all SF6, purify and reuse" during equipment maintenance and gas replacement. This will not only reduce greenhouse gas emissions but also cut costs for purchasing new gas, with the potential to generate additional carbon revenue through CCER trading.
Delivery and Service
Wuhan Moen Intelligent Electric Co., Ltd. has completed factory tests (including vacuum holding, residual pressure testing, and liquid filling tests) according to the contract. Technical engineers have also provided on‑site installation, commissioning, and operation training. The company offers a one‑year warranty and long‑term technical support to ensure stable operation of the units in the hot and humid environment of southern China.
For more product information
To learn more about the MOEORW-WQH11 SF6 gas recovery unit – including detailed technical data, operation videos, or field case studies – please visit the Wuhan Moen Intelligent Electric Co., Ltd. website or contact our sales engin
